Drilling-machine



C. A. HULTQU-IST.'

DRILLING MACHINE. `APPLICATION FILED AUG.26, 1918.

1,890,787. Patendsept. 13,1921.

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c. A. num T. DmLLrNG M E. APPLICATION FILED AUG.26 1918 PatentedSept.13, 1921.

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`omitted for c UNITED STATES PATENT OFFICE.

CHARLES A. HULTQUIST, 0F LGS ANGELES, CALIFORNIA.

l pauline-MACHINE.

Specication of Letters Patent.

Patented Sept. 13, 1921.

Application led August 26, 1918. Serial No. 251,415.

To all whom it may concern.:

Be it known that I, CHARLES A. HULT- QUIsT, a citizen of the UnitedStates, residing at Los Angeles, in the county of Los Angeles and Stateof California, have invented a new and useful Drilling-Machine, of whichthe following is a specification.

This device relates to drilling or boring machines and more especiallyto means for turning the drill steel in a step by step rotation so as tobring its cutting edge into different relations to the surface beingacted upon by the drilling steel.

An object of the invention is to produce a device of this characterwhich .is elicient in operation and not liable to get out of order.

Another object is to minimize wear between certain of the parts of thesteelfturning mechanism.

Another object is to provide a construction in which a certain elementsubject to wear may be readily replaced when it becomes necessary ordesirable to make the replacement. y

Another object is to provide turning mechanism in the head of thedrilling machine.

Other objects and advantages will appear inthe subjoined detaileddescription.

The accompanying drawings illustrate the invention:

Figure 1 is a side elevation of a drilling machine built in accordancewith this invention, a portion of the drill steel being broken away tocontract the view.

Fig. 2 is an enlarged vertical mid section of the head portion of thedrilling machine shown in Fig. 1, the lane of section being Fig. 4 is aplan section on line w-w*,

Fig; 2.

ig. 5 `is a sectional elevation on line :v5-w", Fig. 2 the plunger andvalve being learness of illustration and a portion ofthe valve chamberbeing broken away to contract the view. y

Flg. 6 is an inverted plan section on line mL-w, Fig. 2.

Fig. Z `is a perspective view Aof the plunger. v

Fig. 8'is a b perspective view of the toggle Fig. 9 is a perspectiveview of the steel holding bushing and its pawls.

Fig. 10 is a perspective view of the ratchet ring.

The machine shown in Fig. 1 oi the drawings belongs to the typegenerally known as a stoping machine, and it is understood that theinvention is not restricted to its enibodiment as a stoping machine butis applicable t0 any drilling machine having a drill steel which isrotated with a step by step movement.

There is provided a cylinder 1 and mounted upon the upper end of thecylinder is a head comprising two sections, a lower section 2 and anupper section 3. The lower section 2 is chambered at 1 to accommodate ananvil 5 against which the piston, not shown, workingin the cylinder 1 isadapted to strike as is well understood in the art pertaining to thisclass of drilling machines. The anvil 5 is adapted to strike the buttend of a drill steel 6 which is of angular cross section and which fitsa hole 7 of angular cross section extending axially through a bushing 8.The bushing 8 is journaled in the head section 3 and the bushingcomprises portions having different diameters, an inner base portion 9,a pawl carrying portion 10 of less diameter than the base 9, and anouter end portion 11 of less diameter than the portion 10, journaleddirectly in a reduced portion 12 of the upper head section. The pawlcarrying portion 10 is provided `with longitudinally extending grooves13 so that the pawls 14 can be slid into the grooves 13 from the grooves15. `The pivotal portions 16 of the pawls fit the inner portions of thegrooves 13 so that the pawls cannot be withdrawn from the grooves 13excepting by endwise movement of the pawls into the grooves 15.

The pawls 14 are adapted to engage teeth 17 in a ratchet ring 1S whichis journaled in the head section 3 and engages a shoulder 18 of the headsection 3 It is clear that if the ratchet ring 18 be turned in onedirection the pawls 14 will be engaged by the appropriate teeth to turnthe bushing 8 and that if the ratchet ring 18 be turned in the oppositedirection the teeth will slide over the pawls so as to eii'ect noturning movement of the bushing. The pawls 14 are yieldingly heldoutward in engagement with the appropriate teeth by pins 19 seated inthe outer ends et' recesses 20 in the portion 10 of the bushing, therebeing springs 21 in the inner ends of the recesses to yieldingly holdthe pins 1U outward so as to force the pawls into engagement with theratchet ring.

The base 9 of the bushing is recessed at 22 to accommodate a portion ofthe anvil 5 when said anvil is struck by the piston, not shown.

The means for turning the ratchet'ring 18 will now be described. Theratchet ring is provided with a laterally extending arm 23 having on oneside face a longitudinally extending rib or boss 24 convex in crosssection adapted to engage a flat wear face 25 I at one side of a recess26 which is Jformed in the side of a cylindrical plunger 27. The

opposite side face 28 of the recess 26 is provided with a groove 29extending transversely of the longitudinal axis of the plunger. The arm23 is provided on the side face opposed to that having the boss 24 witha groove 30 extending'parallel with said boss and the groove 29.Engaging the grooves 29 and 30 are the rounded edges 30 of a toggle bar31. Thus the arm 23 and toggle bar 31 Jform a toggle connection betweenthe ratchet ring and the plunger.

The plunger 27 is reciprocatively mounted in a chamber 32 in the headsection 3, the ends of said chamber being formed by removable plugs 33.When the plunger 27 is reeiprocated in the chamber 32 the boss 24 andtoggle 31 serve to communicate motion from the plunger to the arm 23 soas to turn the ring 18 on its axis. It is noted that the return strokeof the ring 18, in which the pawls 14 slip over the teeth 17, iseffected by pressure of the plunger `face 25 against the boss 24. Sincethe pressure required to turn the ring 18 in its non-pawl engagingmovement is comparatively slight, there will be very little wearoccasioned on the face 25 and boss 24. However, when the plunger 27moves in a direction to cause engagement of the ratchet teeth with thepawls, the pressure transmitted from the plunger 27 to the arm 23through the toggle bar 31 is comparatively great and, since the ends ofthe toggle bar rotate in the grooves 29, 30, very little wear isoccasioned. either of the .grooves 29, 30 or of the toggle bar 31. Whenthe toggle bar 31 becomes worn by continued use so that there is toomuch play between it and the arm 23, it is clear that the toggle bar 31may be readily replaced by a new one of the correct size to eliminatethe looseness. The plunger chamber 32 is provided at its opposite endswith Huid induction ports 34, 35which communicate with ports 36, 37respectively located in the head section 2. Also between the ports 34,35 the chamber 32 is provided with exhaust ports 38, 39 whichcommunicate with ports 40, 41 respectively in the head section 2. Theports 3G, 37 communicate with the middle portion of a valve chamber 42in the head section 2 and said ports are controlled by a slide valve 43reciprocatively mounted in the valve chamber, the valve being soconstructed that the port 36 is open when the valve is at one end of thevalve chamber and the port 37 is open when the valve is at the other endof said chamber. The ports 40, 41 communicate with the end portionsrespectively of the valve chamber and are not affected by operation ofthe valve. The valve is of a well known type and therefore needs nofurther description.

Exhaust ports 44, 45 open from the end portions or the valve chamber 42to the atmosphere. A fluid intake port 46 opens to the valve chamber 42from a port 47 in the cylinder 1. Compressed fluid is admitted to theport 47 by suitable valve means indicated in general by the character48. These valve means 48 may7 be of any construction known in the artand therefore not necessary to illustrate and describe in detail herein.It suffices to state that the valve means 48 admit the compressed fluid'from the supply pipe 49 to the cylinder 1 and also to the port 47 tocause the piston, not shown, to deliver its blow on the anvil 5 in amanner well understood and to cause operation of the valve 43 andplunger 27 as will now be made clear.

Surrounding the inner end portion 9 of the bushing is a wear sleeve 50which is of the same diameter as the ratchet ring 18 and. interposedbetween the ratchet ring and the outer end of the head section 2. Thiswear sleeve 50 holds the ratchet ring against the shoulder 18 and alsoserves to cover a recess 51 in the section 3 extending from the plungerchamber to the inner end of the section 3. This recess 51 accommodatesthe arm 23 when the ring 18 is being inserted into the head section 3.Thus the sleeve forms a smooth bearing entirely around the portion 9 ofthe bushing.

In practical operation, the operator will place the tool in position tobring the drill steel G in operative relation with the rock to bedrilled and he will manipulate the liuid admission valve means 48 toadmit compressed iuid to the cylinder 1 in a manner well understood inthe art. Opening of the valve means 48 also admits the compressed fluidto the port 47 and, assuming that the valve 43 is in the position shownin Fig. 4 and that the plunger 27 is in the position shown in Fig. 3, itis clear that the compressed air will pass from the port 47 through theport 46 into the valve chamber 42, thence by way of the ports 37, 35 tothe plunger chamber to drive the plunger in the irection of the arrow a,Fig. 3. The compressed fluid that may be in front of the moving plunger27 exhausts from the lunger chamber through the port 34, ytliiencethrough the port 36 into the valve chamber and from the valve chamber byway of the port 44 to the atmosphere. When the plunger 27 has movedsufficienti far to uncover the port 39 the compressed fluid passes frombehind the plunger 27 through the port 39, thence through the port 41 tothe valve chamber and the compressed fluid then operates to move thevalve 43 in the direction of the arrow b Fig. 4. The valve 43 when thusmoved opens the port 36 and closes the port 37 so that the operatingfluid can pass from the valve chamber through the port 36 thence throughthe port 34 to the plunger chamber to move the plunger in a directionopposite to that indicated by the arrow a, thus causing the plunger toforce compressed air from the valve chamber through the port 35, thencethrough the port 37 to the valve chamber and from the valve chamberthrou h the exhaust port 45 to the atmosphere. hen the plunger has movedsufficiently far to uncover the port 38 the fluid flows through saidport into the port 40 and thence to the valve chamber so as to againmove the valve in the direction indicated by the arrow b.

When the plunger moves in the direction of the arrow a it turns the ring18 counterclockwise in Fig). 3 against the pawls 14 which thereforeecome effective to turn the bushing 8 to rotate the drill steel 6. Whenthe plunger 27 moves in the direction opposite to that indicated by thearrow a it turns the ring 18 clockwise in Fig. 3 so that the teeth 17slip over the pawls 14, which consequently are ineffective to turn thebushing. The next stroke of the plunger 27 in the direction of the arrowa again turns the drill steel. Thus a step-by-step rotation of the drillsteel is effected so as to bring its cutting edge into differentrelations with the material being operated on.

The invention is not limited in its broader aspects to the exact detailsshown in the drawings and above described, but embraces such changes andmodifications as lie within the spirit and scope of the appended claims.

I claim:

1. In a drilling machine, a head having a plunger chamber, a bushingjournaled in the head and adapted to engage a drill steel, a plunger inthe plunger chamber having a recess in one side thereof with a fiatface, a ring journaled in the head and having an arm extending into therecess in the plunger, means to cause a step-by-step rotation of thebushing when the ring is turned, one side face of the arm and of therecess being grooved, the arm having a boss convex in cross sectionbearing against the flat face of the recess, a toggle having roundededges inserted in the grooves respectively, and means to admitcompressed fluid alternatively to opposite ends of the plunger chamberto reciprocate the plunger.

2. In a drilling machine, a sectional head, a plunger chamber in one ofthe sections, a plunger in the plunger chamber, means to admit an oerating fluid to the plunger chamber, a ushing journaled in the head andadapted to engage a drill steel, a ring journaled in the head and havingan arm projecting into the plunger chamber and operative by movement ofthe plunger, means to transmit turning movement from the ring to thebushing, there being a recess extending from the plunger chamber to theinner end of the section having the plunger chamber to accommodate thearm when the ring is being inserted in the head, and a sleevesurrounding the bushing and interposed between the ring and the outerend of the other head section.

Signed at Los Angeles, California, this 19th day of August, 1918.

CHARLES A. HULTQUIST.

Witnesses:

GEORGE H. HILEs, L. BELLE WEAVER.

